Finding the Fourth Proportional to 31,015.68, 42,797.76 and 20,965.98

Step by Step Solution

1. Step 1: Write the proportion equation
   31,015.68 : 42,797.76 = 20,965.98 : x
2. Step 2: Convert to fraction form
   31,015.68/42,797.76 = 20,965.98/x
3. Step 3: Cross multiply
   31,015.68x = 42,797.76 × 20,965.98
4. Step 4: Simplify right side
   31,015.68x = 897,296,980.20
5. Step 5: Solve for x
   x = 897,296,980.20/31,015.68
6. Step 6: Final answer
   x = 28,930.43